This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 6 |
| 3 | -12 |
| 4 | 22 |
| 5 | -40 |
| 6 | 68 |
| 7 | -112 |
| 8 | 182 |
| 9 | -286 |
| 10 | 440 |
| 11 | -668 |
| 12 | 996 |
| 13 | -1464 |
| 14 | 2128 |
| 15 | -3056 |
| 16 | 4342 |
| 17 | -6116 |
| 18 | 8538 |
| 19 | -11820 |
| 20 | 16248 |
| 21 | -22176 |
| 22 | 30068 |
| 23 | -40528 |
| 24 | 54308 |
| 25 | -72378 |
| 26 | 95976 |
| 27 | -126648 |
| 28 | 166352 |
| 29 | -217560 |
| 30 | 283344 |
| 31 | -367552 |
| 32 | 474998 |
| 33 | -611624 |
| 34 | 784812 |
| 35 | -1003712 |
| 36 | 1279562 |
| 37 | -1626216 |